Rivet-cutting tool for air-guns.



PATENTED DEG. 5, 1905;

, H. P. PLUMMBR. 'RIVET cum-me TOOL FOR AIR GUNS.

APPLICATION FILED MAY 31' 1905.

'- hTI5.5

a UNITED; srn'rns PATENT OFFICE; HARRY F. PLUMMER, on-nnrbonn, PENNSYLVANIA.

l RIVET CU TTING oLFoaAIR-cums. i

To all whoiw it may concern: Be it known that I, HARRr F. PLUMMER, a citizen of the United States, residing at Altoona, in the county of Blair, State of Pennsylvania, have invented certain new and useful Improve: -ments in Rivet-Cutting 'lools'for Air-Guns; and l doherebydeclare the following to be a 1 full, clear, and exact description'of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same. 1 Y

This invent"on relates torivet-cutting tools such as are employed for cutting ofltheheads of rivets, the object of the invention being to 5 provide a tool in the form of an attachment for substitution of the hammer that is 'us'ed in connection with what is termed the air-gun in a pneumatic riveting-machine.

A further object of the invention is to provide a tool that will be cheap and simple of manufacture, that will permit of substitution of new blades when the old ones become worn, which will engage the rivet between the head and the surface against which it is formed, 5 and with which the operation of cutting the rivets will be quickly effected.

Other objects and advantages of the invention will be understood from the following description.

In the drawings forming a portion of this specification, and in which like numerals of' reference indicate similar parts in the several views, Figure 1 is a side elevation of the tool.

and the plates with which it is engaged and illustrating the operative positions of the cutting-blades. Fig. 3 is a bottom plan view of the tool. 1

Referring now to the drawings, there is shown a rivet-cutting tool comprising a casing including an upper cylindrical portion 5 and a base portion 6, which is" contracted in one direction and broadened in a different directionat right angles, as illustrated. Formed longitudinally through the base 6 is a passage 7, which opens through the bottom of the base and which communicates at its upper portion with the opening 8 of the cylindrical 5o portion of the casing. Projecting inwardly from the side walls of the passage 7 are-the guides, beads, or flanges 9, the lower faces of which are flush with the bottom of the casing. Mounted slidably in the passage 7 are two cutting blades or members in the form of blocks 10 and 11, which rest upon the flanges V v Specification of Letters Patent. application filed ma 31, 1905. serial No. 263,073.

9 and the lower portions of which are narrowed and continued downwardly between Patented. Dec. 5, 1905.,

said flanges, so as to lie flush with the bottom of the casing. The mutually-adjacent faces of the blocks 10 and "11 are concaved, as illustrated, and these concaved faces form in connection with the bottomfaces of the block the cutting edges 12'and 13, so that when the ed in the casingpthe lower portion of the' plunger comprising the spaced fingers 15 and 16, which are of'a width equal to the narrowed portionof; the casing,- so as to slidably fit it and to permit of movement of the fingers downwardly into the passage 7. The inner faces ofthe' fingers 15- and 16 are beveled at their lower ends, as shown at 17 and 18, to engage the corresponding beveled sides 19 and 20, respectively, of recesses 21 and 22, respectively, in the upper faces of the blocks 10 and 11, so that as the plunger is moved downwardly said blocks will be urged toward each other.

To limit the downward movement of the plunger and the consequent inward movement ofthe cuttingedges 12 and 13, a portion of the body of the plunger and the corresponding upper portion of the casing are enlarged, so that shoulders 25 and 26 are formed upon the plunger and casing, respectively, which by contact limit the downward movement of the plunger.

Inthe sides of the base 6 and in the inner plate or bar 28, which are of athickness somewhat greater than the depths of the channels, so that they lie partly in the path of movement of the blocks 10 and 11 from the passage 7, and thus prevent accidental displacement while permitting ready removal when desired.

A circumscribing groove 30 is formed in the outer face of the upper portion 5. of t e casing to receive the usual retaining devices of the air-gun when the tool is attached, it being understood that the hammer or plunger of the air-gun engages the upper reduced end or stem 31 of the plunger 1 1 in the cutting operation- To prevent upward displacement of the blocks 10 and 11, heads 32 are formed on the upper portions of the side faces of the pas- IIO sage 7 and engage in corresponding grooves in the side faces of the blocks.

The operation of the tool will be apparent from the above description and accompanying illustrations, it being understood that the tool is adjusted to receive the head of the rivet between the cutting-blades, or rather with the cutting edges close against the plate 34:,ag'ainst which the head of the rivet is made. The plunger being then operated upon, the blades are forced toward each other with their cutting edges between the rivet-head and the blade 34:, so as to engage the stem of the rivet and cut ofi the head.

What is claimed is 1. A rivet-cutting tool comprising cutting members slidably mounted for movement toward and away from each other and aplunger constructed and arranged to urge the cutting members toward each other.

2. A rivet-cutting tool comprising acasing having an open bottom, cutting members slidably mounted in the casing and having beveled portions and a plunger in the casing having beveled portions movable over the beveled portions of the cutting members, and

under the influence of which the cutting mem- I bers are movable toward each other.

3. A rivet-cutting tool comprising a casing having an open bottom and inwardly-directed flanges, cutting members slidably mounted 4. A rivet-cutting tool comprising a casing I having a transverse passage in its lower portion communicating with the upper portion of the casing, cutting-blocks slidably mounted in the transverse passage and having cutting edges directed toward each other, removable means for preventing movement of the cutting-blocks from the passage, said blocks having beveled portions, and a plunger mounted in the upper portion of the casing and having beveled portions arranged to engage the corresponding portions of the blocks and under the influence of which the blocks are m0vable toward each other.

In testimony whereof I afiix my signature in presence of two witnesses.

HARRY F. PLUMMER.

Witnesses:

E. M. CoLFoRD, GEO. W. OHANDLEE. 

